How does a correlated subquery differ from a non-correlated subquery?

SQL Data Analyst Hard

SQL Data Analyst — Hard

How does a correlated subquery differ from a non-correlated subquery?

Key points

  • Correlated subqueries depend on the outer query's data
  • Non-correlated subqueries are standalone
  • Correlated subqueries re-execute for each row
  • Non-correlated subqueries execute independently
  • Performance can be affected by choosing between the two types

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